Humidifier tub water level indicator



FIG. 1 is a perspective view of a humidifier tub water level indicator according to a first embodiment showing our new ornamental design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a cross sectional view taken along lines 8-8 of FIG. 2.

Where included, broken lines and all within represent environmental structure and do not form a part of the claimed design. 

CLAIM The ornamental design for a humidifier tub water level indicator, as shown and described. 